/Engine/Source/Developer/VisualGraphUtils/Public/VisualGraph.h
int32 AddEdge ( int32 InSourceNode, int32 InTargetNode, EVisualGraphEdgeDirection InDirection, const [FName](API\Runtime\Core\UObject\FName) & InName, [TOptional](API\Runtime\Core\IO\TOptional)< [FName](API\Runtime\Core\UObject\FName) > InDisplayName, [TOptional](API\Runtime\Core\IO\TOptional)< [FLinearColor](API\Runtime\Core\Math\FLinearColor) > InColor, [TOptional](API\Runtime\Core\IO\TOptional)< EVisualGraphStyle > InStyle )